outlook.live.com quick actions moved to far right of email and I can't move them back beside Sender/From and Subject.

Is there a version of your instructions "for dummies"?

I don't want to steal Ross Duran's thunder since they were the one who originally came up with this fix. Basically his fix is just a javascript which runs and moves the "containers" (DIV tags) that the move and delete buttons are under to a different location (being back to the original location). It's based on the CSS style tag that's applied to these "containers". Unfortunately MS updated these tags and they are pretty randomly named.

Anyways, full steps which I had taken:

1. Install the Tampermonkey extension in your browser (I am using Edge since it's a MS product so Outlook will probably be more supported in it in general). You should be able to find it in the extensions store for the browser (In Edge you can go to the 3 dots>Extensions, then click the "Get extensions for Microsoft Edge" button and search/install the Tampermonkey one.
2. Once installed, click the Details for Tampermonkey in the Extensions tab and then "Extension Options". This should bring up the Tampermonkey settings interface.
3. If you've already setup the script it'll be under "Installed Userscripts" tab (You can edit the existing script by clicking the edit button beside the trashcan icon). If you haven't, then click the + to the left of that tab.
4. Copy and paste the following code, then save the changes via File>Save. The name of the script and such is in the first few lines (which are comments) in case you want to rename it. I had also copied the additional external requirement and put it in the script since that way it's all self-contained.
5. Once saved, refresh Outlook's page if you have it open. That should move the icons over again.

Again, all credit goes to Ross Duran who originally came up with the code/process. I just updated the tags to get it working again.

// ==UserScript==
// @name       outlook quick actions hotfix
// @namespace  www.rossdoran.com
// @version    0.1
// @description  m$.gfy
// @match      https://outlook.office.com/mail/*
// @require http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js
// @run-at document-start
// ==/UserScript==

// custom style

 $('head').append('');

waitForKeyElements(".UWVIR", moveQuickActions);

waitForKeyElements(".QpoLy", moveDeleteAction); // comment out this line to keep the delete quick action on the right

function moveDeleteAction(elem)
{
    var elem = $(elem);
    var parent = elem.parent();

    if (parent.length > 0)
    {
    var newParent = parent.find(".xxeTh.XG5Jd");

    if (newParent.length > 0 && !elem.hasClass("delete-hidden"))
    {
        var clone = elem.clone();

        clone.appendTo(newParent);
        elem.addClass("delete-hidden");

        let rightDeleteAction = elem;

        clone.click(function(e)
        {
            rightDeleteAction.click();

            e.preventDefault();
            return false;
        });

    }

    }
}

function moveQuickActions(elem)
{
    var elem = $(elem);
    var parent = elem.parent().parent();
    if (parent.length > 0)
    {
    var newParent = parent.find(".xxeTh.XG5Jd");

    if (newParent.length > 0)
        elem.detach().appendTo(newParent);
    }
}

/*--- waitForKeyElements():  A utility function, for Greasemonkey scripts,
    that detects and handles AJAXed content.

    Usage example:

        waitForKeyElements (
            "div.comments"
            , commentCallbackFunction
        );

        //--- Page-specific function to do what we want when the node is found.
        function commentCallbackFunction (jNode) {
            jNode.text ("This comment changed by waitForKeyElements().");
        }

    IMPORTANT: This function requires your script to have loaded jQuery.
*/
function waitForKeyElements (
    selectorTxt,    /* Required: The jQuery selector string that
                        specifies the desired element(s).
                    */
    actionFunction, /* Required: The code to run when elements are
                        found. It is passed a jNode to the matched
                        element.
                    */
    bWaitOnce,      /* Optional: If false, will continue to scan for
                        new elements even after the first match is
                        found.
                    */
    iframeSelector  /* Optional: If set, identifies the iframe to
                        search.
                    */
) {
    var targetNodes, btargetsFound;

    if (typeof iframeSelector == "undefined")
        targetNodes     = $(selectorTxt);
    else
        targetNodes     = $(iframeSelector).contents ()
                                           .find (selectorTxt);

    if (targetNodes  &&  targetNodes.length > 0) {
        btargetsFound   = true;
        /*--- Found target node(s).  Go through each and act if they
            are new.
        */
        targetNodes.each ( function () {
            var jThis        = $(this);
            var alreadyFound = jThis.data ('alreadyFound')  ||  false;

            if (!alreadyFound) {
                //--- Call the payload function.
                var cancelFound     = actionFunction (jThis);
                if (cancelFound)
                    btargetsFound   = false;
                else
                    jThis.data ('alreadyFound', true);
            }
        } );
    }
    else {
        btargetsFound   = false;
    }

    //--- Get the timer-control variable for this selector.
    var controlObj      = waitForKeyElements.controlObj  ||  {};
    var controlKey      = selectorTxt.replace (/[^\w]/g, "_");
    var timeControl     = controlObj [controlKey];

    //--- Now set or clear the timer as appropriate.
    if (btargetsFound  &&  bWaitOnce  &&  timeControl) {
        //--- The only condition where we need to clear the timer.
        clearInterval (timeControl);
        delete controlObj [controlKey]
    }
    else {
        //--- Set a timer, if needed.
        if ( ! timeControl) {
            timeControl = setInterval ( function () {
                    waitForKeyElements (    selectorTxt,
                                            actionFunction,
                                            bWaitOnce,
                                            iframeSelector
                                        );
                },
                300
            );
            controlObj [controlKey] = timeControl;
        }
    }
    waitForKeyElements.controlObj   = controlObj;
}

It is absolutely insane to me that this change is so universally hated by outlook.live.com users that at least two of them we know of so far have created/edited scripts to reverse it (JordanMXW and ross doran, thank you both). And yet a Microsoft rep STILL hasn't addressed this 36 page thread or at least provided some type of logical justification for the move. I've said it before and I'll say it again: As an almost 40 year Microsoft fan, beta tester, and multiple platform paying customer, and as a 22 year Microsoft personal email address owner, this is the first time I can say that I am beyond super disappointed in Microsoft.

It's because they've updated the class names. I did some fiddling with mine and got it to work again (not sure if exactly the same as what Ross had before). Here's the lines/changes to do.

waitForKeyElements(".UWVIR", moveQuickActions);

waitForKeyElements(".QpoLy", moveDeleteAction);

Under function moveDeleteAction(elem):

var newParent = parent.find(".xxeTh.XG5Jd");

if (newParent.length > 0 && !elem.hasClass("delete-hidden"))

And under function moveQuickActions(elem):

function moveQuickActions(elem)

{

var elem = $(elem); 

var parent = elem.parent().parent(); 

if (parent.length > 0) 

{ 

var newParent = parent.find(".xxeTh.XG5Jd"); 

if (newParent.length > 0) 

    elem.detach().appendTo(newParent); 

} 

}

My thought too, now we know they someone pays attention from time to time ;-).